SUBFAMILY III. LOCUSTINJE. 393 



182. MELANOPLUS DAWSONI (Scudder), 1875f, 343. Dawson's Locust. 



Size small or medium, the sexes subequal. Above grayish- or olive- 

 brown, tinged with fuscous, beneath dull yellow; the piceous postocular 

 stripe extending only to metazona, subobsolete in female; face and lower 

 half of pronotal lobes olive-gray; metapleura in great part white. Hind 

 femora reddish-yellow, their upper and inner faces usually with faint fus- 

 cous cross-bars. Interocular space about twice the breadth of first an- 

 tennal joint. Frontal costa convex above the ocellus, female, nearly flat 

 throughout, male distinctly punctate. Pronotum short, the disk convex; 

 prozona slightly longer than wide, male, subquadrate, fe- 

 male, less than one-third longer than metazona, the latter 

 with hind margin obtuse-angled. Tegmina as described in 

 key. Supra-anal plate elongate-triangular, its apex acute, 

 lateral margins broader and more elevated on basal half; 

 median sulcus rather shallow, percurrent. Furcula con- 

 sisting of a pair of subparallel, slender, flattened tapering 

 Fig. 137. Dorsal processes lying outside the median ridges (Fig. 137.) 

 male abdomen of Cerci shorter than supra-anal plate, subfalcate, the apical 

 M. dawsoni. third less than half the width of base, feebly concave 

 without, the tips rounded. Subgenital plate small, longer 

 than broad, subpyramidal, apically compressed, the apical margin but fee- 

 bly elevated. Length of body, $, 14 17, 9, 19 22; of antenna?, $, 7.5, 

 9, 6.3; of pronotum, $, 3.54, 9, 5.56; of tegmina, $, 5.37, 9, 5 6; 

 of hind femora, $, 8.7 9, 9 1010.5 mm. (Fig. 138.) 



Toronto, Ontario Walker] ; Crawford Co., Iowa; Lincoln and 

 Valentine, Neb. (Bruner). Scudder (ll)OOa, 102) has recorded this 

 species from Brunswick, Me.; 

 Morse (1919) from Manchester, 

 N. H., and Shull (1911, 226) 

 from Sagiuaw Bay, Mich. It is 

 also known from northern 

 Pennsylvania. E. M. Walker 

 (1S99, 31) states that it is not 

 uncommon near Toronto, "fre- Fig - I3tS - Male - (After Lu er -> 

 quenting dry sandy soil, generally somewhat bushy or scrubby, but 

 also occurring in open sandy fields. At McDonald's Falls on the 

 Severn River, Ont., it was found in a sandy and somewhat hilly 

 district, thinly wooded with oak and white pine and with a scat- 

 tered undergrowth of blueberry, Jersey Tea and Sweet Fern 

 shrubs. The above are the only records from our territory, the 

 general range of the species extending over central southern Can- 

 ada, and from Iowa to Minnesota and Wyoming, southwest to 

 northern New Mexico. A long-winged form (var. coinplctiis Scud- 

 der) with tegmina 15 IT mm. in length, fully developed and 

 greatly surpassing the hind femora, is known, but appears to be 

 scarce. 



